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本文开发了一种便捷的合成含硫、氮和氧原子配位基团的螯合树脂的方法，即以甲基丙烯酸缩水甘油酯为功能单体合成含有环氧基的多孔树脂，然后与半胱胺反应得到含硫、氮和氧原子配位基团的螯合树脂。研究了该螯合树脂对Hg2+、Cu2+和Zn2+等离子的吸附性能。结果表明，螯合树脂对Hg2+的吸附作用大于对Cu2+和Zn2+离子的吸附作用。在介质的pH值为1～5的范围内，在pH=3时树脂对Hg2+离子的吸附量最高，当pH值降低到2和1时吸附量略有下降，但当pH升高到4和5时其吸附量下降较多。对于Cu2+和Zn2+离子，其吸附量随着pH值的升高而增大，在低pH值如pH为1和2时，对于Cu2+和Zn2+离子吸附量很小。因此在低pH值的介质中，该螯合树脂可以从共存金属离子如Cu2+和Zn2+的溶液中选择性地吸附Hg2+。该螯合树脂有望用于含汞离子废水的处理。
Abstract：A facile approach was developed for the synthesis of chelating resins with sulfur,nitrogen and oxygen atoms in the chelating groups. Porous resins with epoxy groups was first prepared by suspension copolymerization using glycidyl methacrylate as the functional monomer. The epoxy group-containing porous resins were then treated with cysteamine to get the chelating resins. Adsorption of Hg2+, Cu2+ and Zn2+ ions onto the chelating resins was investigated. The results showed that the chelating resins possessed stronger adsorption for Hg2+than Cu2+ and Zn2+. The adsorption capacity for Hg2+ was highest in medium at pH=3 in the pH range of 1～5 investigated. The adsorption capacities slightly decreased when p H values decreased to 1 and 2. When p H values increased to 4 and 5, higher decreases in adsorption capacities were observed. The adsorption capacities of the chelating resins for Cu2+ and Zn2+increased with increasing the pH values from 1 to 5, and the adsorption capacities for Cu2+ and Zn2+ were very low at pHs 1 and 2. Accordingly, the chelating resins may selectively adsorb Hg2+from aqueous solutions with the coexistence of other metal ions such as Cu2+ and Zn2+. The chelating resins may find applications in the treatment of Hg2+-containing wastewater.
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基本信息:
DOI：10.16026/j.cnki.iea.2022060538
中图分类号:X703;O647.33;O631.5
引用信息:
[1]李沂航,牛卫卫,张肆硕,等.含硫、氮和氧原子配位基团的螯合树脂的合成及其对Hg~(2+)的吸附[J].离子交换与吸附,2022,38(06):538-547.DOI:10.16026/j.cnki.iea.2022060538.
基金信息:
南开大学沧州渤海新区绿色化工研究院基金项目,批准号：NCC200FH09
2022-12-20
2022-12-20